GPU Memory Bus Error
GPU memory bus errors corrupt data transfer between GPU cores and memory, causing silent data corruption or crashes.
GPU memory bus errors corrupt data transfer between GPU cores and memory, causing silent data corruption or crashes.
What this failure is
GPU Memory Bus Error is a Hardware failure seen during ML training runs. GPU memory bus errors corrupt data transfer between GPU cores and memory, causing silent data corruption or crashes. Common tags: Memory Bus, Hardware, Gpu, Ecc.
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Why it happens (the mechanism)
GPU memory bus hardware fault. Memory channels degraded. Operating temperature too high. Manufacturing defect in GPU memory. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.
What you'll observe
- Training crashes with memory bus error
- Random NaN values in training
- GPU produces corrupted results
Common symptoms and what they mean
| Symptom | Why it happens |
|---|---|
| Xid 48 or 64 in dmesg | GPU memory bus hardware fault |
| ECC uncorrectable errors | Memory channels degraded |
| Memory bus parity errors | Operating temperature too high |
| Training produces inconsistent results across runs | Manufacturing defect in GPU memory |
Which systems are affected
- Aging GPU hardware
- GPUs with memory manufacturing defects
- GPUs operating outside thermal limits
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
- ✓Verified signal present: Xid 48 or 64 in dmesg
- ✓Verified signal present: ECC uncorrectable errors
- ✓Verified signal present: Memory bus parity errors
- ✓Verified signal present: Training produces inconsistent results across runs
- ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.
The fix and the prevention pattern
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Diagnose this failure in VS Code
Select the traceback or open the failed terminal, then run Denpex locally to see the initiating rank, collateral failures, exact fix, and verification command without uploading the log.
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Root cause
- GPU memory bus hardware fault
- Memory channels degraded
- Operating temperature too high
- Manufacturing defect in GPU memory
The fix and how to prevent it
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